import java.io.*;

public class Test {
    public static void main(String [] args) {
        int y = 10;
        int x = y + 5;
        System.out.println("x= " + x);
        System.out.println("Hello world");
    }
}

class Test1  {
    private int x;
    private int y;
    public Test1() {
        x = 0;
        y = 0;
    }
}

class Test2 {
    private int x;
    public Test2(int x) {
        this.x = x;
    }
}